Exhaust pressure reducing attachment for engine exhaust pipes



March 14, 1950 J. w. BARNES 2,500,510

EXHAUST PRESSURE REDUCING ATTACHMENT FOR ENGINE EXHAUST PIPES Filed April 5, 1948 Patented Mar. 14, 1950 EXHAUST PRESSURE REDUCING ATTACH- MENT FOR ENGINE EXHAUST PIPES Jesse W. Barnes, Oneonta, N. Y., assignor of fifty per cent to James J. Byard, 3rd, Oneonta,

Application April 5, 1948, Serial No. 19,075

2 Claims. 1

The present invention relates to new and useful improvements in attachments for engine exhaust pipes and more particularly to a device for reducing the exhaust pressure of the engine.

The primary object of the present invention is to provide an automatic vacuum controlled unit applicable for engines and the like for reducing the exhaust pressure of the engine and which is responsive to the speed of the engine for increasing or decreasing the vacuum therein.

An important object of the invention is to provide an attachment of this character for creating a suction at the outlet end of an exhaust pipe of a motor, vehicle whereby to improve the operation ,of the engine, reduce fuel consumption and reduce carbon deposits in the motor.

A turther, object of the invention is to provide an attachment of this character which may be easily and quickly placed in position on an exhaust pipe without necessitating any changes or alterations in the construction thereof and which at the same time is eflicient and reliable in operation, relatively inexpensive to manufacture and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully, hereinafter described and claimed, reference being had to the accompanying drawing forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a perspective view;

Figure 2 is a similar view of th front end of the attachment; and

Figure 3 is a longitudinal sectional view taken substantially on a line 33 in Figure 2.

Referring now to the drawing in detail wherein for the purpose of illustration I have disclosed a preferred embodiment of th invention, the numeral 5 designates a box-like vacuum chamber which is open at its bottom and provided with an opening 6 in its front wall to receive the rear end of an engine exhaust pipe I to position the chamber transversely at the rear end of the exhaust pipe.

A baflle plate designated generally at 8 of angular construction includes a vertical flange 9 which is suitably secured in confronting relation against the front wall of chamber 5 and also includes an opening ID to receive the exhaust pipe I. The lower end of the flange 9 projects downwardly below the lower edge of the chamber 5. A forwardly inclined flange II is formed at the upper edge of vertical flange 9 2 and extends throughout the length of th chamber 5.

A longitudinally split sleeve I2 is slipped over the exhaust pipe 1 and is formed with a flange l3 at its rear end welded or otherwise suitably secured to the vertical flange 9 of the baffle plate 8. A split clamping collar l4 surrounds the sleeve I2 and is tightened by bolts and nuts l5 to tightly hold the sleeve on the exhaust pipe and to hold the chamber 5 and baffie plate 8 in assembled relation at the rear end of the exhaust pipe.

In the operation of the device with the chamber 5 and baille plate 8 secured in position on the exhaust pipe I in the manner as shown in thedrawing the exhaust from the engine will pass through the exhaust pipe'into the chamber 5 and out through the bottom thereof. The forward motion of the motor vehicle will deflect air downwardly by the forwardly inclined flange ll of the bafile plate 8 as shown by the arrows in Figure 3 of the drawing, the deflected air passing rearwardly under the open bottom of chamber 5 to create a suction therein and thereby aid in pulling the exhaust gases through the exhaust pipe to reduce exhaust pressure therein and to more efiectively scavenge the engine.

The device also deflects the exhaust gases downwardly toward the ground at therear end of the motor vehicle.

In view of the foregoing description taken in conjunction with the accompanying drawing it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention th same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and the scope of the appended claims.

Having described the invention, what is claimed as new is:

1. An engine exhaust pipe attachment for motor vehicles comprising a vacuum chamber having an open bottom, means securing the chamber to an exhaust pipe, and means forming a suction under the chamber by a forward motion of a vehicle, said last named means comprising a baffle plate carried at the front of the chamber and including a forwardly inclined flange rising from the chamber, and a downwardly extending flange projecting below the front edge of the chamber, said vacuum chamber being responsive to the engine speed or a vehicle on which the same is applied.

2. An engine exhaust pipe attachment for m0- tor vehicles comprising an elongated substantially rectangular casing having an open bottom and a forward wall, an attaching sleeve projecting laterallj froni thel forward wa1l 'of "said casing and yieldiri'gly 'enibr'a'ing an exhaust pipe, means clamping said sleeve to an exhaust pipe, a

bafiie plate secured to said forward wall and hav'-"':

ing a forwardly inclined uppegportion extending throughout the length of'saidicasing and rising from the casing. I 7 v WZ BHRNES.

4 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

